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Time-Resolved X-Ray Powder Diffraction Study of Photoinduced Phase Transitions in Ti3 O5 Nanoparticles.
Journal article

Time-Resolved X-Ray Powder Diffraction Study of Photoinduced Phase Transitions in Ti3 O5 Nanoparticles.

  • Tasca KR Institute of Physics "Gleb Wataghin", University of Campinas-UNICAMP, Rua Sérgio Buarque de Holanda, 777, Cidade Universitária Zeferino Vaz-Barão Geraldo, Campinas-SP, 13083-859, Brazil.
  • Esposito V Swiss Light Source, Paul Scherrer Institut, CH-5232, Villigen PSI, Switzerland.
  • Lantz G Institute for Quantum Electronics, Eidgenössische Technische Hochschule (ETH) Zürich, Auguste-Piccard-Hof 1, CH-8093, Zürich, Switzerland.
  • Beaud P Swiss Light Source, Paul Scherrer Institut, CH-5232, Villigen PSI, Switzerland.
  • Kubli M Institute for Quantum Electronics, Eidgenössische Technische Hochschule (ETH) Zürich, Auguste-Piccard-Hof 1, CH-8093, Zürich, Switzerland.
  • Savoini M Swiss Light Source, Paul Scherrer Institut, CH-5232, Villigen PSI, Switzerland.
  • Giles C Institute of Physics "Gleb Wataghin", University of Campinas-UNICAMP, Rua Sérgio Buarque de Holanda, 777, Cidade Universitária Zeferino Vaz-Barão Geraldo, Campinas-SP, 13083-859, Brazil.
  • Johnson SL Institute for Quantum Electronics, Eidgenössische Technische Hochschule (ETH) Zürich, Auguste-Piccard-Hof 1, CH-8093, Zürich, Switzerland.
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  • 2017-02-22
Published in:
  • Chemphyschem : a European journal of chemical physics and physical chemistry. - 2017
Ti3O5
nanoparticles
structural transitions
time-resolved X-ray diffraction
English Nanoparticles of Ti3 O5 have been reported to show a permanent photoinduced phase transition at room temperature. This suggests that light-induced phase transformations of Ti3 O5 nanoparticles may be promising for technological applications. Here, we report a photoinduced semiconductor-to-metal phase transition from β-Ti3 O5 to λ-Ti3 O5 nanoparticles at room temperature observed directly by time-resolved X-ray powder diffraction in a pump-probe setup. The results show a partial structural change, limited by differences between pumped and probed volumes, which persists a few microseconds after excitation. The first step in the relaxation back to the ground state can be described by a single exponential decay with time constant within microsecond timescales. Analysis of the change in lattice constants enables us to estimate an average temperature increase across the phase transition, consistent with a thermally driven process.
Language
  • English
Open access status
closed
Identifiers
Persistent URL
https://folia.unifr.ch/global/documents/94906
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